公开(公告)号：US20190237763A1

公开(公告)日：2019-08-01

申请号：US16312398

申请日：2017-06-19

Applicant: SHOWA DENKO K.K.

Inventor： Yasuaki WAKIZAKA ,  Yoshikuni SATO ,  Daisuke MIYAMOTO ,  Shunsuke YOSHIOKA ,  Daisuke KONO ,  Ayaka IKADO

IPC: H01M4/587 ,  H01M10/0525 ,  C01B32/20

CPC classification number: H01M4/587 ,  C01B32/20 ,  C01B32/205 ,  C01P2002/60 ,  C01P2004/32 ,  C01P2004/51 ,  C01P2004/60 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/40 ,  H01M4/133 ,  H01M4/364 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027

Abstract: A graphite material, including high crystallinity graphite and spherical graphite, in which high crystallinity graphite: (1) a rhombohedral crystal ratio by X-ray diffractometry is 0.02 or less, (2) Lc is 90 nm or more, (3) when a pressure of 1 GPa for 10 seconds is applied to the high crystallinity graphite, the increment rate of the BET specific surface area after applying the pressure to the BET specific surface area before applying the pressure is 90% or less, and (4) D10 is 5.0 μm or more; and in which spherical graphite: (1) a median of the circularity is 0.90 or more, and (2) a tapping density is 1.20 g/cm3 or more; and the ratio by mass of the high crystallinity graphite and the spherical graphite is 95:5 to 40:60; an electrode using the graphite material as an electrode active material; and a lithium ion secondary battery using the electrode.